BitTorrent’s BitTorrent Bleep is a peer-to-peer communications platform. It is a fully distributed SIP (Session Initiation Protocol) server which serves as an engine for Bleep The User Interface, a chat and voice application, which is an enhanced SIP compliant client UAC (User Agent Client) BitTorrent does not track or store information on who is communicating with whom, or when communications happen. We are not even storing data temporarily on servers and then deleting it. All communication is end to end encrypted.”]
Source: https://www.bittorrent.com/blog/2014/07/30/building-an-engine-for-decentralized-communications/